Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf4f70c5bea6cd9…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 23:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0de38d15d93a8acb2c8f8d635a4b8a41 SHA-1: bc7d5a9b8ab37c5b318ea4b8f14db64bec0107fa SHA-256: bcf4f70c5bea6cd9398d3a6a0dc2f12003fe2a0c64a3592343b1c59c854e6609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=minecraft+mod+apk+for+android+1 PDF link annotation
    • http://dkmmotor.com/files/userfiles/file/41834366479.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/54700224413.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/93985880385.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/46bdc581c11e33026540b8d100844785/bewaj.pdfIn PDF document text
    • http://techbis.pl/files/file/wumopajeteliw.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/tawetenofefuf.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/25812357826.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/kifanuno.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/rijawotes.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/zusenomusuwe.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/15959515470.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/jekiperek.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/tusufitagox.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/44993223766.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/58422682660.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/xupavatuwepujidani.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614910fbbba08.pdfIn PDF document text
    • http://grafitym.kz/files/file/95646284989.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/ganuw.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/fufazewevorexabinigosa.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/35427593685.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e5e0934552394fd24ba5e72aa1e07474/909495479.pdfIn PDF document text
    • http://ave-france.com/pics/files/61657950690.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/20961418.pdfIn PDF document text
    • https://people11people.com/uploads/File/74920591629.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BB 15412 bytes
SHA-256: 74e8bb9b932d3bf40c07ff5ce765b869235e25c31077049096d6bb5c1b76618b
font_01_sfnt_off0000daa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 10704 bytes
SHA-256: a1140b2b4a93bf1245d330987a8afc64cf3e773f47510eb61e89eb2ff2d05743